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#include <iostream>
#include <fstream>
#include <string.h>
#include <string>
#include <stdlib.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long long int x[102];
int cifra(int n)
{
int p,j;
p=1;
for(j=1;j<=n;j++)
p=(p*n)%10;
return (x[n-1]+p)%10;
}
int main()
{
int t,i;
char N[100000];
int n,z;
/*for(i=1;i<=100;i++)
x[i]=0; */
x[1]=1; x[0]=0;
for(i=2;i<=100;i++)
{
x[i]=cifra(i);
}
f>>t;
for(i=1;i<=t;i++)
{
f>>N;
z=strlen(N);
if(z==1)n=N[z-1]-'0';
else n=(N[z-2]-'0')*10+(N[z-1]-'0');
g<<cifra(n)<<'\n';
}
return 0;
}